package mlz.b_dateClass;

//long类型表示时间
public class DateClassDemo01 {
    public static void main(String[] args) {
        //获取当前系统时间的毫秒值
        long time = System.currentTimeMillis();
        System.out.println(time);//1728192904727

        //2592000000
        System.out.println(0l + 24*60*60*1000*30l);//-1702967296

    }
}
